AnsweredAssumed Answered

Spurious noise on ADF4159 PLL

Question asked by pichonro on Jul 23, 2014
Latest reply on Apr 10, 2018 by Brigid.Duggan



I have two boards : an EV-ADF4159EB1Z eval board and a prototype with an ADF4159 + 5-10 GHz VCO.


The two boards work well but I have a lot of spurious noise. It is a sweep noise like frequency modulation and covers span band wtih "Max hold" function on spectrum analyser.


I have attached printed screen of spectrum analyser .


I don't understand why I have this spurious noise.


Thanks in advance for your answers.